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/*******************************************************************************
* Copyright (c) 2008, 2016 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.examples.accessibility;
import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.ACC;
import org.eclipse.swt.accessibility.Accessible;
import org.eclipse.swt.accessibility.AccessibleAdapter;
import org.eclipse.swt.accessibility.AccessibleControlAdapter;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.accessibility.AccessibleValueAdapter;
import org.eclipse.swt.accessibility.AccessibleValueEvent;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
/**
* This example shows how to use an AccessibleValueListener to provide
* additional information to an AT.
*/
public class AccessibleValueExample {
private static int value = 40;
private static int min = 0;
private static int max = 100;
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setLayout(new FillLayout());
shell.setText("Accessible Value Example");
final Canvas canvas = new Canvas(shell, SWT.DOUBLE_BUFFERED);
canvas.addPaintListener(e -> {
Rectangle rect = canvas.getClientArea();
String val = String.valueOf(value);
Point size = e.gc.stringExtent(val);
e.gc.setBackground(e.display.getSystemColor(SWT.COLOR_LIST_SELECTION));
e.gc.fillRectangle(0, 0, rect.width * value / (max - min), rect.height);
e.gc.drawString(val, rect.x + (rect.width - size.x) / 2, rect.y + (rect.height - size.y) / 2, true);
});
Accessible accessible = canvas.getAccessible();
accessible.addAccessibleListener(new AccessibleAdapter() {
@Override
public void getName(AccessibleEvent e) {
e.result = "The value of this canvas is " + value;
}
});
accessible.addAccessibleControlListener(new AccessibleControlAdapter() {
@Override
public void getRole(AccessibleControlEvent e) {
e.detail = ACC.ROLE_PROGRESSBAR;
}
});
accessible.addAccessibleValueListener(new AccessibleValueAdapter() {
@Override
public void setCurrentValue(AccessibleValueEvent e) {
value = e.value.intValue();
canvas.redraw();
}
@Override
public void getMinimumValue(AccessibleValueEvent e) {
e.value = Integer.valueOf(min);
}
@Override
public void getMaximumValue(AccessibleValueEvent e) {
e.value = Integer.valueOf(max);
}
@Override
public void getCurrentValue(AccessibleValueEvent e) {
e.value = Integer.valueOf(value);
}
});
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) display.sleep();
}
display.dispose();
}
}
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